The plasmodium in the case of the species now considered is as concerns the _type_, of course, unknown. In one or two gatherings referred here the color of the plasmodium was noted greenish-yellow. This has the look of _S. flavogenita_; but small spores and delicate make-up take it the other way. Miss Lister makes it varietal to No. 12, next following. 12. STEMONITIS AXIFERA (_Bull._) _Macbr._ PLATE VI., 5, 5 _a_, and 5 _b_. 1791. _Trichia axifera ferruginea_ Bull., _Champ. de la Fr._, p. 118, tab. 477. 1818. _Stemonitis ferruginea_ Ehr., _Syl. Myc. Berol._, p. 20; et auct. Europ. ex parte; Americ., non. 1894. _Stemonitis ferruginea_ Ehr., List., _Mycetozoa_, p. 115, in part. 1899. _Stemonitis axifera_ (Bull.) Macbr., _N. A. S._, p. 120, in part. 1911. _Stemonitis ferruginea_ Ehr., Lister, _Mycetozoa, 2nd ed._ Sporangia terete, acuminate, fasciculate small in dense clusters, distinctly ferruginous in color, stipitate, from 10-15 mm. in height; the stipe black one-third to one-half the total height, not shining or polished; columella evenly branching, dissipated before reaching the acuminate apex; capillitium-branches clear brown anastomosing and dividing more or less to bear the superficial fine-meshed net; spores pallid, faintly ferruginous, smooth or nearly so, 5-6 mu. This would seem to be the common _ferruginous_ species of the world. Doubtless Micheli had the thing before him when he drew Tab. 94, _clathroidastrum_, Hoffman and Jacquin seem to have recognized the form. To be sure, under the present plasmodic limitations we cannot be quite certain about these references. Not until 1791 does anyone write down a particular species as marked by a white plasmodium, and distinguish it from other similar fructifications having similar origin. Bulliard, _l. c._, does this, discriminating between _T. axifera ferruginea_ and _C. typhoides_; see under the last-named species. Youthful Ehrenberg, in his doctor's thesis, nearly thirty years later, draws a similar parallel but ignores the great French author, writing _S. ferruginea_ Ehr. as though the thing had never been seen before! By this name it has been called until very lately; Fries accepting it, but noting that the plasmodium, for him at least, was _yellow_! In 1904 Dr. E. Jahn, following Fries' suggestion, established the fact that Ehrenberg's white-plasmodic species had small spores, that Fries had in mind a form with larger spores, having indeed yellow plasmodium; but see number 13 below. It is for the present assumed that the plasmodium of our American _S. axifera_ is white. So far, there are few or no observations which establish the fact. The color, the small smooth spores, the fine-meshed capillitial net and the general dimensions determine the reference. 13. STEMONITIS FLAVOGENITA _Jahn._ PLATE XX., Figs. 10, 10 _a_, 10 _b_.